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Title: ISMabs: A COMPREHENSIVE X-RAY ABSORPTION MODEL FOR THE INTERSTELLAR MEDIUM

We present an X-ray absorption model for the interstellar medium, to be referred to as ISMabs, that takes into account both neutral and ionized species of cosmically abundant elements, and includes the most accurate atomic data available. Using high-resolution spectra from eight X-ray binaries obtained with the Chandra High Energy Transmission Grating Spectrometer, we proceed to benchmark the atomic data in the model particularly in the neon K-edge region. Compared with previous photoabsorption models, which solely rely on neutral species, the inclusion of ions leads to improved spectral fits. Fit parameters comprise the column densities of abundant contributors that allow direct estimates of the ionization states. ISMabs is provided in the appropriate format to be implemented in widely used X-ray spectral fitting packages such as XSPEC, ISIS, and SHERPA.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Centro de Física, Instituto Venezolano de Investigaciones Científicas (IVIC), P.O. Box 20632, Caracas 1020A (Venezuela, Bolivarian Republic of)
  2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, 02138 (United States)
  3. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  4. Department of Physics, Western Michigan University, Kalamazoo, MI 49008 (United States)
Publication Date:
OSTI Identifier:
22364246
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 800; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION SPECTRA; ASTROPHYSICS; ATOMS; BENCHMARKS; BINARY STARS; COMPARATIVE EVALUATIONS; DENSITY; ELEMENT ABUNDANCE; INTERSTELLAR SPACE; LINEAR ABSORPTION MODELS; NEON; POWER TRANSMISSION; RESOLUTION; X RADIATION